Shelby Mesh Back Operator Chair With Fabric Seat & HeadrestShelby Mesh Back Operator Chair With Fabric Seat & Headrest Inspired by the bridge pose of yoga, the Shelby Bifma certified ergonomic chair ingeniously embraces a 3D dynamic dual back to relieve the pressure felt by your lumbar region, and help you maintain the right sitting posture for long hours, preventing back related issues. Shelby is at the forefront of the healthy workplace campaign and makes activity a part of your working routine. 30 degree